Back massaging machine



FIG. 1 is a perspective view of a back massaging machine, showing my new design;

FIG. 2 is a front end elevational view thereof;

FIG. 3 is a rear end elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a side elevational view thereof, opposite that shown in FIG. 4;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a back massaging machine, as shown and described. 